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+GnuCap is a general purpose circuit simulator.  GnuCap was
+formerly known as ACS.  GnuCap performs nonlinear
+dc and transient analyses, fourier analysis, and ac analysis
+linearized at an operating point.  It is fully interactive and
+command driven.  It can also be run in batch mode or as a server.
+The output is produced as it simulates.  Spice compatible models
+for the MOSFET (level 1-7) and diode are included in this
+release.
+ 
+Since it is fully interactive, it is possible to make changes and
+re-simulate quickly.  The interactive design makes it well suited
+to the typical iterative design process used it optimizing a circuit
+design.
+
+Unlike Spice, the engine is designed to do true mixed-mode
+simulation. Most of the code is in place for future support of
+event driven analog simulation, and true multi-rate simulation.
+	 
+If you are tired of Spice and want a second opinion, you want to
+play with the circuit and want a simulator that is interactive,
+you want to study the source code and want something easier to
+follow than Spice, or you are a researcher working on modeling
+and want automated model generation tools to make your job easier,
+try GnuCap.